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Circuit Sports aluminum coolant reserve tank for the Mazda Miata NA6/NA8 will last a life time and is guaranteed to improve the aesthetic of your engine bay. The Circuit Sports Aluminum coolant reservoir tank includes a clear viewing tube to display coolant level. This tank would be the perfect solution to replace the worn/dull, OEM tank and is also a direct replacement of the OEM unit. Circuit Sports tanks utilizes the factory brackets for an easy installation.